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CN-122000148-A - High-performance glass insulator and preparation method thereof

CN122000148ACN 122000148 ACN122000148 ACN 122000148ACN-122000148-A

Abstract

The invention belongs to the technical field of insulating materials of power equipment, and particularly discloses a high-performance glass insulator and a preparation method thereof, wherein the high-performance glass insulator comprises, by mass, 65.0-75.0wt% of silicon oxide, 6.0-8.0wt% of calcium oxide, 2.0-4.0wt% of potassium oxide, 10.0-12.0wt% of sodium oxide, 3.0-5.0wt% of magnesium oxide, 2.0-4.0wt% of aluminum oxide, 0.5-1.5wt% of zirconium oxide and 0.5-1.5wt% of barium oxide. The invention adopts the high-performance glass insulator and the preparation method thereof, and the method is based on a composition-structure-performance association model, strictly follows five core design principles, and realizes the cooperative promotion of the electrical performance, the mechanical performance, the thermal performance and the stability of the glass insulator by precisely regulating and controlling the composition and the preparation process of the glass formula.

Inventors

  • LIU GUO
  • XIE XINMING
  • LIU ZHONG
  • Peng deke
  • ZHENG JIAO
  • ZHOU QIFENG

Assignees

  • 江西中瓷电气有限公司

Dates

Publication Date
20260508
Application Date
20260401

Claims (10)

  1. 1. The high-performance glass insulator is characterized by comprising, by mass, 65.0-75.0wt% of silicon oxide, 6.0-8.0wt% of calcium oxide, 2.0-4.0wt% of potassium oxide, 10.0-12.0wt% of sodium oxide, 3.0-5.0wt% of magnesium oxide, 2.0-4.0wt% of aluminum oxide, 0.5-1.5wt% of zirconium oxide and 0.5-1.5wt% of barium oxide.
  2. 2. The high-performance glass insulator according to claim 1, wherein the high-performance glass insulator comprises, by mass, 70% of silicon oxide, 7% of calcium oxide, 3% of potassium oxide, 11% of sodium oxide, 4% of magnesium oxide, 3% of aluminum oxide, 1% of zirconium oxide and 1% of barium oxide.
  3. 3. A method for producing a high-performance glass insulator according to any one of claims 1 to 2, comprising the steps of: Step S1, weighing raw materials including quartz sand, sodium carbonate, potassium carbonate, calcium carbonate, magnesium oxide, aluminum oxide, zirconium oxide, barium carbonate and regenerated broken glass according to the mass percentage of each component, crushing the raw materials until the particle size is less than or equal to 1mm, and sieving through a 100-mesh screen; s2, putting the raw materials into a drying oven for drying; s3, putting the raw materials and the composite clarifying and homogenizing agent into a V-shaped mixer for mixing, and sieving through a 20-40 mesh screen to obtain a mixture; wherein, the mixture is stored in a sealed bag for no more than 24 hours, and is matched and used at any time; Step S4, uniformly adding the mixture into a kiln through a feeder at a feeding rate of 2.5-3 t/h to melt the mixture to obtain glass liquid; And S5, sequentially carrying out molding and tempering treatment on the glass liquid, and carrying out impact test after the completion of the molding and tempering treatment to remove unqualified products which have defects inside and are easy to burst, thus obtaining the high-performance glass insulator.
  4. 4. The method for preparing a high-performance glass insulator according to claim 3, wherein in the step S1, the SiO 2 content in the quartz sand is more than or equal to 99.5%; The content of SiO 2 in the regenerated broken glass is more than or equal to 70%, the content of impurities is less than or equal to 1.0%, and the addition amount of the regenerated broken glass is 20-30% of the total addition amount of the raw materials.
  5. 5. The method for preparing a high-performance glass insulator according to claim 3, wherein in the step S2, the drying temperature is 105-110 ℃ and the drying time is 2-3 hours.
  6. 6. The method for preparing the high-performance glass insulator according to claim 3, wherein in the step S3, the rotating speed of the V-shaped mixer is 20-30 r/min, and the mixing is carried out until the uniformity is more than or equal to 95%.
  7. 7. The method for preparing a high-performance glass insulator according to claim 3, wherein the composite clarifying and homogenizing agent comprises cerium oxide, antimony trioxide and borate in a mass ratio of 0.8-1:0.5-0.6:0.3-0.4; the addition amount of the composite clarifying homogenizing agent is 0.1-0.3% of the total addition amount of the raw materials.
  8. 8. The method for manufacturing a high-performance glass insulator according to claim 3, wherein in the step S4, melting is performed by heating from 23-25 ℃ to 1500-1550 ℃ at a rate of 5 ℃ per minute.
  9. 9. The method for manufacturing a high-performance glass insulator according to claim 3, wherein step S5 specifically comprises: s51, feeding molten glass into a compression molding device, wherein the compression molding temperature is 750-850 ℃, the compression molding pressure is 8-12 MPa, and the pressure maintaining time is 3-4S, so as to prepare an umbrella skirt and core rod integrated blank of the glass insulator; S52, placing the green body into a temperature equalization furnace for conveying, heating and preserving the temperature to 650-700 ℃ before tempering in the temperature equalization furnace, heating and preserving the temperature for 2-3 min, and then entering a physical tempering furnace for tempering and strengthening, and heating the glass green body to the tempering temperature; S53, quenching the glass blank by vertically symmetric cold air, wherein the temperature of the cold air is 20-30 ℃, the cold air is dry and oil-free and anhydrous, the pressure of the cold air is 0.4-0.6 MPa, the deviation of the wind pressure from the upper side to the lower side is less than or equal to +/-0.02 MPa, the distance between a wind gap and the surface of the glass blank is 15-30 mm, and the quenching time is 30-60S, so that the toughened glass insulator is obtained; and S54, performing impact test and cleaning on the toughened glass insulator to obtain the high-performance glass insulator.
  10. 10. The method of claim 9, wherein in step S52, the tempering temperature is Tg+50-80 ℃, wherein Tg is the glass transition temperature.

Description

High-performance glass insulator and preparation method thereof Technical Field The invention belongs to the technical field of insulating materials of power equipment, and particularly relates to a high-performance glass insulator and a preparation method thereof. Background The glass insulator is used as a core insulation and mechanical support component in the electric power transmission line, and the performance of the glass insulator directly determines the safety and stability, the service life and the operation and maintenance cost of the power transmission system. With the rapid development of the power grid in China to the high-voltage, direct-current and long-distance conveying directions, higher requirements are put forward on the performance of the glass insulator, and the glass insulator not only needs to have excellent electrical insulation performance (such as low dielectric loss, high dielectric strength and stable volume resistivity) and mechanical performance (such as high bending strength and high hardness), but also needs to adapt to complex outdoor environments (such as salt fog, ultraviolet rays and temperature rapid change), and meanwhile, production feasibility, cost controllability and green sustainable development requirements are considered. At present, the formula design of the glass insulator in the prior art is mainly adjusted empirically, and the support of a system composition-structure-performance correlation model is lacked, so that the formula optimization blindness is large, the cooperative promotion of each performance index is difficult to realize, and the problem of 'failure in consideration' often occurs. The method is characterized by comprising the following steps of (1) poor performance cooperativity, wherein in the prior art, the balance among the electrical performance, the mechanical performance and the thermal performance of the glass insulator is difficult to realize, (2) insufficient production suitability, namely, the melting temperature of the existing part of high-performance glass insulator formula design is too high and is not matched with the existing charged fluxing horseshoe flame kiln equipment of most of domestic factories, if the production is realized, the existing equipment needs to be modified in a large scale, the production cost and the production risk are increased, and (3) imbalance of green environmental protection and cost control, namely, the existing formula is partially pursued for high performance, rare metal oxides (such as rare earth oxides and noble metal oxides) are excessively used, the raw material cost is greatly increased, and the large-scale industrial production is difficult to realize due to rare metal resources scarcity, and on the other hand, the existing preparation process mainly adopts raw materials, does not fully utilize renewable resources (such as regenerated broken glass), has high energy consumption, and the emission of pollutants such as CO 2 and the like, and does not meet the national 'double carbon' and green industrial development requirements. (4) The crystallization control effect is poor, the existing glass insulator formula is not designed by systematically referencing a glass forming area diagram and a phase diagram, the composition points near a eutectic point or a phase boundary line are not preferentially selected, and only a single oxide is simply added to inhibit crystallization, so that the crystallization rate of the glass is higher in the melting, cooling and long-term use processes, the crystallization phenomenon can damage the uniformity of the glass, the mechanical strength is reduced, the dielectric loss is increased, and the service life of the insulator is shortened. (5) The adaptability of the direct current electric field is poor, and the performance defect of the existing glass insulator under the action of the direct current electric field is increasingly prominent along with the wide application of the direct current transmission technology. Because the ion mobility is not adjusted pertinently by the existing formula, the migration speed of alkali metal ions (Na +、K+) is high, so that the dielectric loss is increased, the problems of insulation aging, electric leakage and the like are easy to occur after long-term use, and the long-term stable use requirement under a direct current field cannot be met. Therefore, there is a need in the art to develop a high performance glass insulator and a method for manufacturing the same, which can effectively solve the above problems. Disclosure of Invention The invention aims to provide a high-performance glass insulator and a preparation method thereof, wherein the method is based on a composition-structure-performance correlation model, strictly follows five core design principles (performance guiding, low crystallization optimization, production adaptation, cost controllability and green sustainability), realizes the cooperative promotion of th